JP4102152B2 - Hot maintenance method of tundish - Google Patents

Hot maintenance method of tundish Download PDF

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Publication number
JP4102152B2
JP4102152B2 JP2002290852A JP2002290852A JP4102152B2 JP 4102152 B2 JP4102152 B2 JP 4102152B2 JP 2002290852 A JP2002290852 A JP 2002290852A JP 2002290852 A JP2002290852 A JP 2002290852A JP 4102152 B2 JP4102152 B2 JP 4102152B2
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Prior art keywords
tundish
nozzle
maintenance
hot
field
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JP2002290852A
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JP2004122192A (en
Inventor
欣晃 木村
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Nippon Steel Corp
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Nippon Steel Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、連続鋳造用のタンディッシュを熱間で整備する方法に関する。
【0002】
【従来の技術】
従来、連続鋳造用のタンディッシュを整備する場合は、鋳造後、通常は、鋳造位置から離れたタンディッシュの整備場まで移動し、タンディッシュを一旦冷却し、タンディッシュ内の残鋼滓をはつり作業にて取り除き、次に耐火物の補修あるいはノズルの交換など行なっていた。そのため、タンディッシュの整備には長時間を要し、その分タンディッシュ基数も多く必要であり、また、再使用前には、タンディッシュをまた所定の温度まで加熱する必要があり、そのためのエネルギー使用量も大きかった。このため最近では、タンディッシュを冷却しないで熱間で整備する方法が実施されている。
例えば、特許文献1に開示されているようなタンディッシュの熱間整備方法がある。この方法は、鋳造終了後、鋳型位置から近距離の位置に移し、その位置にてのろ返しを行なって残溶鋼および溶融スラグをそのまま排出することによって固着スラグのかき出し作業を不要にし、速やかに整備作業を行なうというものである。
【0003】
【特許文献1】
特開平9−225600号公報
【0004】
【発明が解決しようとする課題】
しかし、上記特許文献1の方法では、タンディッシュ内の残鋼滓を排出するのにタンディッシュを傾転する必要があり、そのため、大がかりな設備が必要となり、また、スペースもかなり大きく必要としている問題があった。
本発明は、このようなタンディッシュの熱間整備を行うに際し、タンディッシュの傾転を必要とせず、タンディッシュを水平のままで、効率よく残鋼滓を排出する方法を提供することにある。
【0005】
【課題を解決するための手段】
本発明の主旨は、次の通りである。
(1) 熱間でタンディッシュを整備するに際し、下記(a)〜(d)の手順で整備作業を行なうことを特徴とするタンディッシュの熱間整備方法。
(a)鋳造終了後、タンディッシュを整備場に移動し、ノズル直胴部に対し横方向に吐出孔が加工されている浸漬ノズルに対し浸漬ノズルの吐出孔より上方部分を打撃によって折って、ノズルの上部を残した状態で撤去し、当該ノズル位置からタンディッシュ内残鋼滓を排出し、
(b)酸素によってタンディッシュ内あるいはノズル内を洗浄し、
(c)上ノズル以外のプレート・ノズル類を取り外し、
(d)新たなプレート・ノズル類を取り付け、次の鋳造に供する。
(2) 前記タンディッシュの整備場に排滓場、ノズル交換場、および浸漬ノズル予熱場があり、前記(a)、(b)作業を当該排滓場で、前記(c)作業を当該ノズル交換場で、前記(d)作業を当該浸漬ノズル予熱場で行なうことを特徴とする(1)記載のタンディッシュの熱間整備方法。
(3) 前記鋳造終了後、残鋼滓を加熱および/または残鋼滓に融解剤を添加することを特徴とする(1)又は(2)記載のタンディッシュの熱間整備方法。
(4) 前記タンディッシュ内残鋼滓を排出する際に、排滓場で浸漬ノズルを撤去せず、浸漬ノズル直胴部から折って排出することを特徴とする(1)乃至(3)のいずれか1項記載のタンディッシュの熱間整備方法。
【0006】
上記したように本発明の特徴は、タンディッシュ内の残鋼滓をタンディッシュを傾転するのではなく、浸漬ノズルを撤去し、そのノズル孔から排出することを基本とするものである。従って、タンディッシュは終始水平のままで、従来法のように傾転するための大がかりな設備もスペースも必要としない。また、ノズル孔から残鋼滓を排出するに際しタンディッシュの形状あるいは、排出する手順などその効率の良い方法を構築したものである。
【0007】
【発明の実施の形態】
まず、本発明の基本とする作業手順を説明する。
図1は、本発明の基本的な作業(a)〜(d)を示したものである。
(a)鋳造終了後、鋳造位置近くのタンディッシュ整備場にタンディッシュを移動し、まず浸漬ノズル孔からの残鋼滓の排出口を確保する。排出孔確保方法は浸漬ノズルを取り外しても、またノズル直胴部に対し横方向に吐出孔が加工されている浸漬ノズルの場合は、浸漬ノズルの吐出孔より上方部分を打撃によって折ってもよく、いずれにしても残鋼滓がストレートに排出できるルートを短時間で確保できれば良い。その後、タンディッシュノズルを開とし、タンディッシュ内の残鋼滓を排出する。このとき、浸漬ノズルを折ってノズルの上部を残した状態で残鋼滓を排滓すると、排滓時およびこの後に行なうノズル内部の酸素での洗浄時に浸漬ノズルと下部ノズルとの接合面への地金垂れかけなどを防ぐことができ、新品の浸漬ノズルの取り付けが容易にできる。
(b)この浸漬ノズルの取り外しおよび取り付けのとき、必要に応じて、酸素ランスによる酸素吹付けなどにより、ノズル周りの付着鋼滓をきれいに取り除いておくことが重要である。このことにより、ノズルの取り外しの際に、取り外し易く、且つ、新品のノズルを取り付ける時には接着面に異物がなく取り付け易くなる。
(c)次に、上ノズル以外のプレートあるいは下部ノズルなどを取り外し撤去し、新品のプレートあるいはノズルを取り付ける。
(d)最後に新品の浸漬ノズルを取り付ける。浸漬ノズルは、ノズル閉塞あるいは、地金付着防止のため、極力取り付け直前まで、あるいは取り付けてから次のタンディッシュ使用まで予熱し、タンディッシュに取り付ける。
【0008】
以上、熱間で整備したタンディッシュを次の使用タイミングで鋳造位置に移動し、鋳造に供する。ここで、タンディッシュ整備場に、排滓場、ノズル交換場、浸漬ノズル予熱場を配設しておき、上記(a)、(b)の作業を排滓場で、(c)の作業をノズル交換場で、(d)の作業を浸漬ノズル予熱場で、それぞれ実施することが望ましい。
また(b)のときに、残鋼滓の排出性を向上するためにタンディッシュ内に酸素で溶融洗浄または加熱で溶融する、あるいは、スラグの融点を低減する融解剤を添加することも有効である。
【0009】
次に、前記タンディッシュの熱間整備に適したタンディッシュ構造について説明する。
図2は、本発明に用いるタンディッシュの一実施例を示す図である。図示するように、タンディッシュ1の底部には傾斜部2が付与されて、ノズル孔3の位置が最も低くなるようにつくられており、タンディッシュが水平のままでも、周辺の残鋼滓が速やかにノズル孔3に向けて流れるようにしている。傾斜部2は適宜耐火物によって形成される。また、図示していないが、タンディッシュ内において、溶湯の落下位置両側に設けてある堰4には、その下部にタンディッシュノズル側に通じる孔を設けてあり、鋳造終了後、堰内の残鋼滓が速やかにタンディッシュノズル側に流出するようにしている。
【0010】
このようなタンディッシュの構造により、タンディッシュの整備に際しその傾転を必要としないで作業を遂行できるので、その分の設備コストやスペースが必要なく、効率よくタンディッシュの熱間整備が可能となった。
本発明の適用結果、タンディッシュ本体の寿命は従来の冷間整備時に比較して約6倍、heats/TDは冷間設備時の約7倍、タンディッシュ耐火物コストは従来の4割にも削減できた。
【0011】
【発明の効果】
以上の如く本発明熱間整備方法により、設備改造のための設備コストやスペースを大きくとる必要はなく、且つ、従来に比較して飛躍的に耐火物コストを低減することができた。
【図面の簡単な説明】
【図1】本発明にかかる熱間整備方法に基づく作業手順(a)〜(d)を示す図。
【図2】本発明に係るタンディッシュの具体例を示す図。
【符号の説明】
1 タンディッシュ
2 傾斜部
3 ノズル孔
4 堰
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tundish for continuous casting in a method of servicing in hot.
[0002]
[Prior art]
Conventionally, when preparing a tundish for continuous casting, after casting, it is usually moved to a tundish maintenance site away from the casting position, the tundish is once cooled, and the remaining steel plate in the tundish is suspended. They were removed by work, and then repaired refractories or replaced nozzles. For this reason, it takes a long time to maintain the tundish, and a large number of tundish radixes are required.In addition, it is necessary to heat the tundish to a predetermined temperature before reuse, and energy for that purpose is required. The amount used was also large. For this reason, recently, a method for maintaining the tundish hot without cooling it has been implemented.
For example, there is a hot maintenance method for tundish as disclosed in Patent Document 1. In this method, after casting is completed, the mold position is moved to a position at a short distance, and the residual molten steel and molten slag are discharged as they are by turning back at that position. It is to perform maintenance work.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-225600
[Problems to be solved by the invention]
However, in the method of Patent Document 1, it is necessary to tilt the tundish in order to discharge the remaining steel slag in the tundish. Therefore, a large-scale facility is required and a large space is also required. There was a problem.
It is an object of the present invention to provide a method for efficiently discharging the remaining steel slag while keeping the tundish horizontal without requiring the tilting of the tundish when performing such hot maintenance of the tundish. .
[0005]
[Means for Solving the Problems]
The gist of the present invention is as follows.
(1) A hot maintenance method for a tundish, characterized in that when the tundish is maintained hot, the maintenance work is performed according to the following procedures (a) to (d).
(A) After the casting is finished, the tundish is moved to the maintenance area, and the portion above the discharge hole of the immersion nozzle is folded by hitting the immersion nozzle in which the discharge hole is processed in the transverse direction with respect to the nozzle body, Remove with the upper part of the nozzle left, and discharge the steel residue in the tundish from the nozzle position.
(B) The inside of the tundish or the nozzle is cleaned with oxygen,
(C) Remove the plates and nozzles other than the upper nozzle,
(D) A new plate / nozzle is mounted and used for the next casting.
(2) The tundish maintenance site includes a waste disposal field, a nozzle exchange field, and an immersion nozzle preheating field. The operations (a) and (b) are performed in the waste disposal field, and the operation (c) is performed in the nozzle. The method for hot maintenance of a tundish according to (1), wherein the operation (d) is performed in the immersion nozzle preheating field in an exchange field.
(3) The hot maintenance method for a tundish according to (1) or (2), wherein after the casting is finished, the remaining steel plate is heated and / or a melting agent is added to the remaining steel plate.
(4) When discharging the remaining steel plate in the tundish, the immersion nozzle is not removed at the discharge field, but is folded and discharged from the body portion of the immersion nozzle. (1) to (3) A hot maintenance method for a tundish according to any one of the preceding claims .
[0006]
As described above, the feature of the present invention is based on the fact that the remaining steel plate in the tundish is not tilted but the immersion nozzle is removed and discharged from the nozzle hole. Therefore, the tundish remains horizontal throughout and does not require large-scale equipment and space for tilting as in the conventional method. Moreover, when discharging the remaining steel sheet from the nozzle hole, an efficient method such as the shape of the tundish or the discharging procedure is constructed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
First, the work procedure that is the basis of the present invention will be described.
FIG. 1 shows basic operations (a) to (d) of the present invention.
(a) After completion of casting, move the tundish to the tundish maintenance facility near the casting position, and first secure a discharge port for the remaining steel slag from the immersion nozzle hole. The method for securing the discharge hole is to remove the immersion nozzle, or in the case of an immersion nozzle in which the discharge hole is processed laterally with respect to the nozzle body, the portion above the discharge hole of the immersion nozzle may be broken by striking In any case, it is only necessary to secure a route in which the remaining steel can be discharged straight in a short time. Then, the tundish nozzle is opened and the remaining steel slag in the tundish is discharged. At this time, if the remaining steel plate is removed with the immersion nozzle folded and the upper part of the nozzle left, the surface of the immersion nozzle and the lower nozzle can be joined to the surface during the discharge and the subsequent cleaning with oxygen inside the nozzle. It is possible to prevent sag dripping, and easy installation of a new immersion nozzle.
(b) When removing and installing the immersion nozzle, it is important to cleanly remove the steel plate around the nozzle by blowing oxygen with an oxygen lance if necessary. Thus, when removing the nozzle, it is easy to remove, and when a new nozzle is attached, there is no foreign matter on the adhesive surface and it is easy to attach.
(c) Next, the plate other than the upper nozzle or the lower nozzle is removed and removed, and a new plate or nozzle is attached.
(d) Finally, install a new immersion nozzle. The immersion nozzle is attached to the tundish by preheating until the next tundish use until just before installation or as soon as possible to prevent nozzle clogging or adhesion of metal.
[0008]
As described above, the tundish prepared hot is moved to the casting position at the next use timing and used for casting. Here, a waste disposal field, a nozzle exchange field, and a submerged nozzle preheating field are arranged in the tundish maintenance site, and the operations (a) and (b) above are performed in the waste disposal site. It is desirable to perform the operation (d) in the nozzle exchange field and the immersion nozzle preheating field.
In (b), it is also effective to add a melting agent that melts or melts with oxygen in the tundish to improve the discharge efficiency of the remaining steel slag, or reduces the melting point of the slag. is there.
[0009]
Next, a tundish structure suitable for hot maintenance of the tundish will be described.
FIG. 2 is a diagram showing an embodiment of a tundish used in the present invention. As shown in the figure, an inclined portion 2 is provided at the bottom of the tundish 1 so that the position of the nozzle hole 3 is the lowest. It promptly flows toward the nozzle hole 3. The inclined portion 2 is appropriately formed of a refractory. Although not shown, the weir 4 provided on both sides of the molten metal drop position in the tundish is provided with a hole in the lower part thereof that leads to the tundish nozzle side. The steel slag flows out quickly to the tundish nozzle side.
[0010]
With this tundish structure , work can be performed without the need for tilting the tundish, so there is no need for equipment costs and space, and hot tundish can be efficiently maintained. became.
As a result of application of the present invention, the life of the tundish body is about 6 times that of the conventional cold maintenance, heats / TD is about 7 times that of the cold equipment, and the tundish refractory cost is 40% of the conventional Reduced.
[0011]
【The invention's effect】
As described above, according to the hot maintenance method of the present invention, it is not necessary to increase the equipment cost and space for equipment modification, and the refractory cost can be drastically reduced as compared with the conventional one.
[Brief description of the drawings]
FIG. 1 is a diagram showing work procedures (a) to (d) based on a hot maintenance method according to the present invention.
FIG. 2 is a diagram showing a specific example of a tundish according to the present invention.
[Explanation of symbols]
1 Tundish 2 Inclined part 3 Nozzle hole 4 Weir

Claims (4)

熱間でタンディッシュを整備するに際し、下記(a)〜(d)の手順で整備作業を行なうことを特徴とするタンディッシュの熱間整備方法。
(a)鋳造終了後、タンディッシュを整備場に移動し、ノズル直胴部に対し横方向に吐出孔が加工されている浸漬ノズルに対し浸漬ノズルの吐出孔より上方部分を打撃によって折って、ノズルの上部を残した状態で撤去し、当該ノズル位置からタンディッシュ内残鋼滓を排出し、
(b)酸素によってタンディッシュ内あるいはノズル内を洗浄し、
(c)上ノズル以外のプレート・ノズル類を取り外し、
(d)新たなプレート・ノズル類を取り付け、次の鋳造に供する。
A hot maintenance method for a tundish, characterized in that when the tundish is maintained hot, the maintenance work is performed according to the following procedures (a) to (d).
(A) After the casting is finished, the tundish is moved to the maintenance area, and the portion above the discharge hole of the immersion nozzle is folded by hitting the immersion nozzle in which the discharge hole is processed in the transverse direction with respect to the nozzle body, Remove with the upper part of the nozzle left, and discharge the steel residue in the tundish from the nozzle position.
(B) The inside of the tundish or the nozzle is cleaned with oxygen,
(C) Remove the plates and nozzles other than the upper nozzle,
(D) A new plate / nozzle is mounted and used for the next casting.
前記タンディッシュの整備場に排滓場、ノズル交換場、および浸漬ノズル予熱場があり、前記(a)、(b)作業を当該排滓場で、前記(c)作業を当該ノズル交換場で、前記(d)作業を当該浸漬ノズル予熱場で行なうことを特徴とする請求項1記載のタンディッシュの熱間整備方法。  The tundish maintenance site includes a waste field, a nozzle exchange field, and an immersion nozzle preheating field. The operations (a) and (b) are performed in the waste field, and the process (c) is performed in the nozzle exchange field. The method for hot maintenance of tundish according to claim 1, wherein the operation (d) is performed in the preheating field of the immersion nozzle. 前記鋳造終了後、残鋼滓を加熱および/または残鋼滓に融解剤を添加することを特徴とする請求項1又は2記載のタンディッシュの熱間整備方法。  The method for hot maintenance of tundish according to claim 1 or 2, wherein after the casting is finished, the remaining steel sheet is heated and / or a melting agent is added to the remaining steel sheet. 前記タンディッシュ内残鋼滓を排出する際に、排滓場で浸漬ノズルを撤去せず、浸漬ノズル直胴部から折って排出することを特徴とする請求項1乃至3のいずれか1項記載のタンディッシュの熱間整備方法。 4. When discharging the residual steel slag in the tundish, the immersion nozzle is not removed in the evacuation field, but is folded and discharged from the straight body portion of the immersion nozzle. Hot tundish maintenance method.
JP2002290852A 2002-10-03 2002-10-03 Hot maintenance method of tundish Expired - Fee Related JP4102152B2 (en)

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